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Implementing Model-View-Presenter in ASP.NET

, 17 Nov 2007 CPOL
Three implementations of Model-View-Presenter in ASP.NET 2.0.
MVPSampleApp.zip
MVP.SampleApp
Lib
Microsoft.Practices.EnterpriseLibrary.Common.dll
Microsoft.Practices.EnterpriseLibrary.Data.dll
MySql.Data.dll
nunit.framework.dll
Rhino.Mocks.dll
Model
Data
Interfaces
Properties
Presentation
Presentation.Tests
Properties
Interfaces
Properties
SubSonic
ActiveRecord
Builder
CodeGeneration
Templates
CodeLanguage
Configuration
Controls
Calendar
lang
skin
active-bg.gif
calendar.gif
dark-bg.gif
hover-bg.gif
menuarrow.gif
normal-bg.gif
rowhover-bg.gif
status-bg.gif
title-bg.gif
today-bg.gif
Resources
DataProviders
Properties
Sql Tools
SubSonic.snk
Sugar
WebApp
App_Data
Views
SQL2000SampleDb.zip
SQL2000SampleDb.msi
/* Originaly found the code here 
 * A tool for dynamic compile and run of C# or VB.NET code
 * http://www.codeproject.com/dotnet/DynamicCompileAndRun.asp
 * By dstang2000. 
 */

using System;
using System.IO;
using System.Text;
using System.Collections;
using System.Collections.Specialized;
using System.ComponentModel;
using System.Data;

using System.Reflection;
using System.CodeDom;
using System.CodeDom.Compiler;
using Microsoft.CSharp;
using Microsoft.VisualBasic;

namespace SubSonic.CodeGenerator
{
	public class CompileEngine
	{
		public CompileEngine( string code )
		{
			this.SourceCode = code;
		}

		public CompileEngine( string code, ICodeLanguage language, string entry )
		{
			this.SourceCode = code;
			this.Language = language;
			this.EntryPoint = entry;
		}

		public void Run()
		{
			ClearErrMsgs();
            //Utilities.Utility.WriteTrace("Building Assembly");
            Assembly assembly = CreateAssembly(SourceCode);

            if (assembly == null) {
                Utilities.Utility.WriteTrace("Assembly is NULL - that means there's an error. Serving up Exception...");

                //get the error message and throw an Exception
                string sMessage = "Error generating template code: this happens because the rendering code (not that of the template) " + Environment.NewLine +
                " has encountered an error. Most likely it has to do with a Primary Key - make sure one is defined for this table." + Environment.NewLine +
                " Other possibilities revolve around reserved words and naming... Here's some more detail:" + Environment.NewLine +
                this.errMsg.ToString();

                throw new Exception(sMessage);

            } else {
                Utilities.Utility.WriteTrace("Compiling Assembly Code... Good to Go...");
                CallEntry(assembly, EntryPoint);

            }


		}

		public string OutputText;

		//Holds the main source code that will be dynamically compiled and executed
		internal string SourceCode = string.Empty;
		
		//Holds the method name that will act as the assembly entry point
		internal string EntryPoint = "Main";

		//A list of all assemblies that are referenced by the created assembly
		internal ArrayList References = new ArrayList();
	
		//A flag the determines if console window should remain open until user clicks enter
		//internal bool WaitForUserAction = true;

		//Flag that determines which languae to use
		internal ICodeLanguage Language = new CSharpCodeLanguage();

		// compile the source, and create assembly in memory
		// this method code is mainly from jconwell, 
		// see http://www.codeproject.com/dotnet/DotNetScript.asp
		private Assembly CreateAssembly(string strRealSourceCode)
		{
            if (strRealSourceCode.Length == 0)
			{
				LogErrMsgs("Error:  There was no CS script code to compile");
				return null;
			}

			//Create an instance whichever code provider that is needed
			CodeDomProvider codeProvider = Language.CreateCodeProvider();

		    //create the language specific code compiler
			//ICodeCompiler compiler = codeProvider.CreateCompiler();
            
			//add compiler parameters
			CompilerParameters compilerParams = new CompilerParameters();
			compilerParams.CompilerOptions = "/target:library"; // you can add /optimize
			compilerParams.GenerateExecutable = false;
			compilerParams.GenerateInMemory = true;			
			compilerParams.IncludeDebugInformation = true;

			// add some basic references
			compilerParams.ReferencedAssemblies.Add( "mscorlib.dll");

            compilerParams.ReferencedAssemblies.AddRange((string[])References.ToArray(typeof(string)));
			//add any aditional references needed
            //foreach (string refAssembly in References)
            //{
            //    try
            //    {
            //        string trimchar = Environment.NewLine;
            //        string trimmedref = refAssembly.Trim(trimchar.ToCharArray());
            //        trimmedref = trimmedref.Trim();
            //        if(trimmedref.Length > 0)
            //            compilerParams.ReferencedAssemblies.Add(trimmedref);
            //    }
            //    catch { }
            //}

			//actually compile the code

			CompilerResults results = codeProvider.CompileAssemblyFromSource(compilerParams, strRealSourceCode);

			//Do we have any compiler errors
			if (results.Errors.Count > 0)
			{
				foreach (CompilerError error in results.Errors)
					LogErrMsgs("Compile Error:  " + error.ErrorText );

				return null;
			}

			//get a hold of the actual assembly that was generated
			Assembly generatedAssembly = results.CompiledAssembly;

			//return the assembly
			return generatedAssembly;
		}

		// invoke the entry method
		// this method code is mainly from jconwell, 
		// see http://www.codeproject.com/dotnet/DotNetScript.asp
		private void CallEntry(Assembly assembly, string entryPoint)
		{
			try
			{
				//Use reflection to call the static Main function
				Module[] mods = assembly.GetModules(false);
				Type[] types = mods[0].GetTypes();

				foreach (Type type in types)
				{
					MethodInfo mi = type.GetMethod(entryPoint, 
							BindingFlags.Public | BindingFlags.NonPublic | BindingFlags.Static);  
					if (mi != null)
					{
						if( mi.GetParameters().Length == 1 )  
						{
							if( mi.GetParameters()[0].ParameterType.IsArray )
							{
								string [] par = new string[1]; // if Main has string [] arguments
								 mi.Invoke(null, par);
							}
						}
						else
						{
							OutputText = (string)mi.Invoke(null, null);
						}
						return;
					}

				}

				
			}
			catch
			{
				//LogErrMsgs("Error:  An exception occurred", ex);	
                //throw ex;
                //if there's an error here, it's not a bad template - that would
                //be caught above. It's because the template, as designed, won't work
                //there's generally only one cause - NO PRIMARY KEY
                Utilities.Utility.WriteTrace("!!!!!!!!!! No primary key defined for this table - ####### ABORTED #######");

                //swallow it
                
			}
		}

		internal StringBuilder errMsg = new StringBuilder();
		internal void LogErrMsgs(string customMsg)
		{
			LogErrMsgs(customMsg, null);
		}

		internal void LogErrMsgs(string customMsg, Exception ex)
		{
			//put the error message into builder
            errMsg.Append("\r\n").Append(customMsg).Append(Environment.NewLine);

			//get all the exceptions and add their error messages
			while (ex != null)
			{
				errMsg.Append("\t").Append(ex.Message).Append(Environment.NewLine);	
				ex = ex.InnerException;
			}
		}

		internal void ClearErrMsgs()
		{
			errMsg.Remove( 0, errMsg.Length );
		}
	}
}

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License

This article, along with any associated source code and files, is licensed under The Code Project Open License (CPOL)

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About the Author

Alex Mueller
Web Developer
United States United States
No Biography provided

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Web03 | 2.8.141015.1 | Last Updated 17 Nov 2007
Article Copyright 2007 by Alex Mueller
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